private void AddPoint_Load(object sender, EventArgs e) { comboBoxMaMh.ValueMember = "MaMh1"; comboBoxMaMh.DisplayMember = "TenMh1"; comboBoxMaMh.DataSource = MonHoc.GetMonHocs(); comboBoxMaMh.SelectedIndex = 0; for (int i = 1; i <= 4; i++) { comboBoxLanThi.Items.Add(i + ""); } comboBoxLanThi.SelectedIndex = 0; }